Quote 22
But to harm who? Was not everyone connected with that sad story now dead? (11.73)
Come to think of it, Arthur has a point. Why is the woman in black still seeking revenge? It's not like there's anyone still around who directly wronged her. Can it really be called revenge if she's not hurting the people who hurt her.
Quote 23
There was nothing else the woman could do to me, surely, I had endured and survived. (11.146)
See that "surely"? That's two big, fat syllables of foreshadowing. When Arthur says "surely," we immediately know that the woman isn't done with him yet.
Quote 24
"You told me that night—" I took a deep breath to try and calm myself. "A child—a child in Crythin Gifford has always died." (12.6)
Arthur fears the woman in black will take revenge on the town because he happened to see her. He's both right and wrong—she's going to take revenge, but not on the townsfolk.